Meeting Banner
Abstract #4267

Repeatability of magnetic field homogeneity and temperature stability in a 47mT Halbach array measured by an open-source field mapping robot

Ivan Etoku Oiye1, Enlin Qian2, and Sairam Geethanath1
1Johns Hopkins University, Baltimore, MD, United States, 2Columbia University in the City of New York, New York, NY, United States

Synopsis

Keywords: Low-Field MRI, Low-Field MRI

Motivation: Lab-scale magnet construction and optimization at low fields (< 1T) depends significantly on the magnetic field mapping robot for characterizing the magnet’s homogeneity and stability. This is important because low-field magnets are more susceptible to environmental variations than well-insulated superconducting magnets.

Goal(s): To establish the performance of the home-built field mapping robot and evaluate the repeatability of a 47mT Halbach scanner's magnetic field homogeneity.

Approach: We assessed the robot's spatial accuracy and characterized a Halbach system for spatio-temporal repeatability in magnetic field strength and bore temperature, simultaneously.

Results: The robot accomplished sub-millimeter accuracy and the repetability experiments demonstrated a CV < 5%.

Impact: The homemade mapping robot provides accurate and simultaneous multi-parameter mapping useful for characterizing low-field magnets. The repeatability and stability of the magnetic field strength of the Halbach scanner indicate consistent scanner operation, which is essential for portable low-field scanners.

How to access this content:

For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.

After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.

After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.

Click here for more information on becoming a member.

Keywords